Spark arrester



Jan. 7, 1930. G. CARPENTER 1,742,198

SPARK ARRESTER Filed April 1, 1924 4A7 INVENTOR ATTORNEYS Patented Jan.7, 1930 UNITED STATES Application filed April 1,

My invention relates to that class of devices, inthe art of arresting,cooling and collecting, of sparks accompanying the prod nets ofcombustion in locomotive engines,

such as set forth and described in my prior applications for patents andwhich bear Serial Numbers 693,185 and 693,186 each of which was filedFeb. 16, 1924, and has for its object to locate a helically formedmember forming a spiral passage, which I employ and which imparts acentrifugal force to the gases, in a position, with relation to the exitstack, that will cause it to function at sub stantially the centralpoint of the gas flow. Another object is to simplify the construction toa great degree and yet sacrifice no efiiciency thereby.

My invention can be more clearly understood by reference to theaccompanying drawings, which illustrate a preferred form ofconstruction, in which Fig. 1 shows a longitudinal sectional view of theforwardpart of an engine fitted out with my device, and

Fig. 2 shows a transverse sectional view' taken on the line 22 ofFig. 1. 1

Referring to the accompanying drawings the reference numeral 10 is usedto indicate numeral 11 the smoke box, the numeral 12 the smoke stack,and 13 the exhaust jet, all of which is common to the ordinary type ofengines. However, in my construction the smoke stack 12 where itprojects downwardly into the smoke box has been materially shortened andas a consequence the jet 13 has been correspondingly elevated, for it isnecessary to have the jet located in close proximlty to, and centrallyof, the lower open end of the stack.

Midway between the fire tubes 10 and the smoke stack 12, and in the saidsmoke box, I have secured a vertical partition 14 and extendingforwardly therefrom to a point beyond the smoke stack 12, andslightlybelow the same, is a horizontally disposed portion 15, and extendingdownwardly from the forward end of this partition 15 to the lower end ofthe smoke box is a third partition 16. Thus it is apparent the threepartitions the fire tubes of a locomotive engine, the

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SPARK ARRESTER i 1924.- Serial No. 703,392.

14, 15 and 16, form a chamber in the smoke box; which except as will behereinafter set forth is entirely separated from the smoke chamber, andthe chambenthus formed I designate as my collection chamber 17.

In this co'llection chamber 17, and preferably centrally thereof, and'extending between and secured to the partitions 14 and 16, is ahorizontally secured cylinder 18, which is closed at its'rear end.Surrounding this cylinder 18, and evenly spaced there from, is a second,or outer, cylinder19, and between these two cylinders I have mounted ahelically formed member, its blade contacting the outer surface oftheinner cylinder 18 and the inner surface of the outer. cylinder 19. Anopening is provided through the partition 14 into the space between thetwo said cylinders and another opening is provided through the partitionl-6leading from the space between the cylinders to the forward end ofthe smoke box. Thus it is seen gases from the fire tubes can passthrough the rear end of the smoke box, through the spiral passagebetween the cylinders and into the forward end of the smoke box, thenceupwardly and through the smoke stack 12. As the action of the jetproduces a high velocity a strong centrifugal force is imparted to thegases, through the function ing of the hclically formed member as theypass through the spiral passage formed therein, and this operatestothrow the particles of solids (commonly called sparks) outwardly tothe inner surface of the outer cylinder 19. As it is my purpose toarrest and collect these unconsumedsolids, I have attached a pluralityof baflies 20 to the inner surface of this cylinder 19, and they arepreferably arranged to oppose the flow of the gases. The particlesstrike these baffles and i are arrested thereby and then pass throughthe openings 21 (which I have provided in the cylinder wall in closeproximity to the said baflies) into the collection chamber 17 wherethey, by gravity, fall to the bottom thereof. I have also provided adoor 22 in the base of the collection chamber and by opening this doorthe collected solids may be cleaned out of the collection chamber 17.

Having thus described my invention what I claim and desire to secure byLetters Patent of the United States, is:

A spark arrester for locomotive engines employing a fire box, comprisinga smoke stack; a smoke box; a chamber, provided with openings,positioned beneath the smoke stack and in the smoke box; a helicallyformed member mounted in said chamber,

its blade contacting the inner wall of the chamber, to form anopen-ended spiral passage through the chamber; baflles on the innersurface of the chamber, a bafile being positioned adjacent each of theopenings in the wall; an exhaust element, centrally located beneath thesmoke stack, the parts being so arranged as to conduct the smoke fromthe fire box to the said chamber and through the aforesaid spiralpassage before it reaches the smoke stack, substantially as shown anddescribed.

GUY CARPENTER.

